Jack



May 17, 1932. w. B. RUNYAN JACK Filed June 4, 1928 -VENTOR A TTORNEYPatented May 17, 1932 Uhtii" STATES PATENT FFICE WILLIAM B. RUNYAN, FDAYTON, OHIO, ASSIGNOR TO THE DAYTON MALLEABLE IRON COMPANY, OF DAYTON,OHIO, A CORPORATION OF OHIO JACK Application filed June 4,

This invention relates to lifting jacks and particularly to acks of themultiple lift type. One object of the invention is to provide a liftingack of the multiple lift type having a plurality of threaded liftingmembers, the jack being simple and cheap in construction and arranged sothat the lifting members may readily be raised or lowered through theremote operation of its operating mechanism.

vAnother object of the invention isthe provision of a lifting jackhaving a rotatable driving member for operating a lifting member, thisrotatable member having provisions for retaining it on the standard andfor con- 3,5 veniently operating it directly by hand.

Other objects and advantages of the invention will be apparent from thefollowing description and from the accompanying drawings in which Fig. 1is a vertical sectional view through a jack constructed in accordancewith the present invention; c

2 is a central vertical section on the line 2-2 of Fig.1;

Fig. 3 is a horizontal section on the line of Fig.1;and Fig. 4 is an endview of the driving member. As illustrating a' preferred embodiment ofthe invention double screw jack particularly 1J0 adapted for use inconnection with vehicles equipped with balloon tires is herein setforth. Referringto the drawings the jack comprises a hollow standardhaving a base 11. Loosely mounted within the standard is a hollow orsleeve-like outer lifting member 12 provided with a cylindrical bore orpassage 13. This member, 12 is externally threaded as indicated at 14and is received within a. rotatable collar 15 which isinternallythreaded as indicated at 16 to engage with the threaos 14 of the on erscrew member.

1928. Serial No. 282,722.

yoke 20, having an opening 21 therein through which the outer screwmember 12 readily moves, the yoke being-provided with a down turnedflange 22 adjacent the opening 21 for cooperating withthejupper end ofthe collar 15 to restrain upward movement thereof and maintain thecollar in operative position on the standard. Thelyoke is also providedwith a guide opening or passage 25 within which is mounted the rotatabledriving or socket member 26. This socket member carries a bevel pinionupon the inner end thereof, which meshes with a bevel gear 31 carried bythe collar 15, the arrangement being such that rotation of the drivingor socket member 26 will cause rotation of the collar 15 in onedirection or the other.-

The socket member 26 is provided with a non-circular opening 32 adaptedto receive a correspondingly shaped end of a suitable operating handle33' so that that rotatable driving or socket member 26 can be rotatedremotely or from a convenient distance. The operating handle 33 isadapted to be easily inserted and removed from the socket 32 and i Thiswire the adjacent surface of the sleeve portion of the standard andengages. a shallow groove provided near the end of thesocket memb r,attheends $61 and at the depressed portions 62 of the wire devicebetween adjacent lobes. The ends --61 are cut off sharply as shown andare arranged to meet the shallow groove portion of the socket member ata suitable angle so that these ends have 'a tendency to diginto themetal of the socket memher and prevent relative turning of these partsin either direction. The wire device 34 is sprung on the endof thesocket member and when in place it abuts the end of the adjacent portionof the standard and thus serves 5 manual movement of the socket memberand the consequent movement of the lifting member of the jack withoutemployin the remotely operated handle 33. The Tobe portions of the wiredevice, projecting as they do beyond the adjacent cylindrical standardportion can readily be operated by the thumb and fingers of the hand ofthe operator to approximately adjust the position of the liftmg membersso that the jack is ready to engage a load, or so that the liftingmembers may be lowered into their lower retracted positions.

Adjacent the upper end of the bore 13 the inner wall of the main orouter screw member 12 is provided with internal screw threads as shownat 35, which are adapted to engage the external threads of an innerscrewmember 36 which is thus received by the outer screw member. Uponrelative rotation of the outer and inner screw members the latter willbemoved axially either up or down relative to the former. The inner screwmember is provided at its upper end with a saddle or cap 37 which isadapted to receive the load, such as the axle of an automobile, this capbeing preferably rigidly secured to the member 36 by means of afastening pin or by any other suitable means.

The construction, as thus far described, is such that upon rotation ofthe collar 15 relative to the outer screw member 12, the latter iscaused to move up or down within the standard. Likewise rotation of theouter screw member 12 relative to the inner screw member36 will causethe latter to be moved either up or down within the outer screw member.Consequently, should the socket member 26 and the collar 15 be rotatedwhile the cap 37 is in engagement with the load, there will be either arotation of the collar with respect to the outer screw member to causeaxial movement of the latter, or the outer screw member may rotate withthe collar to cause axial movement of the inner screw member. Howeverthe jack must 0rdinarily be operated somewhat before the cap is broughtinto contact with the load, and the present invention contemplates theprovision of means for-yieldingly resisting rotation of the outer screwmember relative to the standard so that axial movement of the outerscrew member 12 within the collar may result during the initialoperation of the jack.

A slide member 40 is provided having one or more lugs 41, 42 which areguided vertically and are freely slidable in the standard in slot-s orguides 43 which extend along the inner wall of the standard to points 44adjacent the cylindrical guide surface 45 near the ball bearing and thusprevent rotation of this member 40 during operation of the jack. Theslide is provided with a cylindrical portion 46 which is freely receivedin the lower end of the outer screw member 12. A transversely extendinghole 47 in the slide member 40 receives a pair of steel balls 48 betweenwhich is a spring 49 which presses the balls outwardly. The size of thehole 47 is justslightly larger than the diameter of the balls 48 so thatthe latter may be moved in a radial direction within the hole. The ballsare adapted to normally project somewhat beyond the outer cylindricalsurface 46 of the slide member 40 and into a shallow groove 50 extendingcircumferentially around the inner cylindrical bore near the lower endof the outer screw member 12. At one point along the shallow groove 50is a socket or pocket 52, preferably only a little less in ex tent thanthe diameter of the balls, which may be caused by drilling a hole 58through the wall of the outer screw member as shown in Fig. 2, whichpocket 52 acts as a non-positive or yielding lock forresistingrotational movement of the balls within the groove 50. Vhen oneof the balls is thus engaged within this pocket the pressure of thespring is effective to hold the ball within the enlargement to thusinterpose a yielding resistance to rotation of the outer screw memberwith respect to the standard. As the ball is only partially received inthe pocket 52, as shown in Fig. 2, the pressure of the spring may beovercome and the ball may be forced out of the enlargement to permitrotation of the outer screw member in the standard. The balls, theshallow groove 50, and the pocket 52 thus serve to hold the member 40within the lower end of the bore of the outer screw, and also yieldinglyresist rotation of the outer screw. When the collar 15 is rotated theouter screw tends to rotate with it: but the resistance of the member40, due to the yielding locking of the balls in the pocket 52, tends toovercome this rotative effect and the outer screw is therefore heldagainst rotation, so that it will travel axially, until this yieldinglocking effect is overcome,as will occur when the upward travel of themember 40 brings the lugs to the upper ends of the grooves 43. Byincreasing or decreasing the strength of the spring 49, the relativedepth of engagement of the balls in the pocket 52, the abruptness of thewalls of the pocket 52, etc., the degree of yielding resistance may bevaried.

The assembly of the various parts of the jack is accomplished in a verysimple man ner merely by inserting the spring and then the balls in thehole 47 of the slide member 40 and th n pressing the slide member in theend of the outer screw member until the balls spring out and engage theshallow groove 50, and it will also be apparent that the parts are verysimple in their construction andare easily and cheaply made.

The operation of the jack will now be apparent. Upon rotation of thesocket 26, the collar 15 is rotated, and if the load is not engaged bythe cap 37, the outer screw member 12 will be moved ax ally withoutrotation, the yielding restraint of one of the balls 48 in theenlargement 52 at the lower end of the outer screw member beingeffective to yieldingly restrain rotation of the outer screw member atthis time. During the elevation of the outer screw member, beforeengagement with the load, the inner screw 36 moves with the outer screwmember and remains in its lowermost or normal position within the outerscrew. When the load is engaged by the cap 37 rotation of the innerscrew member is prevented. Upon continuing the rotation of the collar 15the outer screw member 12 may be either rotated or moved ax allydependent upon the strength of the spring-4L9 and the two screw membersare thus raised until the pin 55 which is provided in one of the threadgrooves. of the outer screw member engages the lower face of the collar15. Further axial movement of the outer screw member without rotation isthus prevented, and the outer screw member is then rotated with thecollar 15 to screw the inner screw member 36 out of the outer screwmember. It will be apparent that the inner screw member 36 will be movedaxially by rotation of the outer screw member 12 as the fcrmerisprevented from turning by the engagement of the cap 37 with the load. Apin 56 provided in a thread groove of the inner screw member near itsbottom end is provided to engage the lower end of the internal threadsto prevent the inner screw memberfrom being screwed entirely out of theouter screw member.

To effect the lowering of the load, and the withdrawal of the screwmembe's into the standard, the collar 15 is rotated in a reversedirection. The outer screw member will thus be moved axially in adownward direction until the lower end of the outer screw member isadjacent the base ofv the standard, at which time a pin 58 engages thetop of the collar 15 to prevent any further axial movement. During thislowerng of the outer screw member its rotation yieldingly prevented inthe standard by the effective operation of the balls "one of whichremains seated in the pocket 52. The yielding engagement of the ballswith the outer screw member is overcome after the outer screw member hasbeen lowered and when the pin 58 engages the top of the collar 15 sothat the outer screw member is caused to rotate with the collar towithdraw the inner screw member. After the load is disengaged the innerscrew member may read ily be rotated so that it is screwed into theouter screw member to its extreme lower position in case thedisengagement ofthe load occurs before the inner screw member isentirely withdrawninto the jack.

While the form of apparatus herein dcscribed constitutes a preferredembodiment of the invention it is to be understood that the invention isnot limited to this precise form of apparatus, and that changes may bemade therein without departing from the scope of the invention which isdefined in the appended claims.

What is claimed is: r I

1. A lifting jack comprising ahollow standard, an externally threadedouter screw member mounted in the standard, an inner screw memberthreaded in the outer-screw member, means for elevating the screwmembers comprising an internally threaded r0- tatable collar engagingthe threads of the outer screw member, and means yieldingly carried bythe outer screw member for relative rotational movement with respectthereto and comprising a. member slidably guided in the standard forcausing axial movement of the outer screw member on rotation of thecollar. I

2. A lifting 'jack comprising a hollow standard, an externally threadedouter screw member mounted in the standard, an inner screw memberthreaded'in the outeri screw member, means for elevating the screwmembers comprising: an internally threaded r0- tatable collar engagingthe threads of the outer screw member, means carried by'the outer screwfor axial'movement therewith and fixed against rotation in the standard,and a spring-pressed device provided in said last named means foryieldingly engaging the lower end of the outer screw member for causingit to be moved axially by rotational movements of the collar.

I 3. A lifting jack comprising a hollow standard, an externally threadedouter screw member mounted in the standard, an inner screw memberthreaded in the outer screw member, means for elevating the screwmembers comprisingan internally threaded rotatable collar engaging thethreads of the outer screw member, and means for causing axial movementof the outer screw member comprising a slide telescopically received inthe lower end of the outer screw member, a guide in the standard forsaid slide, a lug on said slide received in said guide, andaspring-pressed ball held in said slide, said outer screw member having ashallow groove receiving said ball to cause the slide to be movedaxially with the outer screw member, said groove having an enlargedportion partially receiving the ball to yieldingly restrain relativerotation of the outer screw member and the slide.

4. A lifting jack comprising a hollow standard, an externally threadedouter screw member mounted in the standard, an inner screw memberthreaded in the outer screw member, means for elevating the screwmembers comprising an internally threaded rotatable collar engaging thethreads of the outer screw member, and means yieldingly carried by thelower end of the outer screw member and movable axially therewith andcomprising a member'positively restrained against rotational movementsby the standard for causing axial movement of the outer screw member onrotation of the collar.

5. A lifting jack comprising a hollow standard, an externally threadedouter screw member mounted in the standard, an inner screw memberthreaded in the outer screw member, means for elevating the screwmembers comprising an internally threaded rotatable collar engaging thethreads of the outer screw member, means movable axially at all timeswith the outer screw member and fixed against rotation in the standard,and a spring pressed device provided in said last named means foryieldingly engaging the lower end of the outer screw member for causingit to be moved axially by rotational movements of the collar.

6. A lifting jack comprising a standard, a rotatable interiorly threadeddriving member mounted in the standard, an exteriorly threaded screwsleeve meshing within the driving member, the sleeve being alsointeriorly threaded, a second screw meshing with the internal threads ofthe sleeve and cooperating means comprising a guide-way on the standardand a friction clutch carried by the screw sleeve for normally resistingrotary movement of the sleeve, but yielding to permit the sleeve to turnwith the driving means when at the limits of its vertical movement, saidclutch frictionally engaging the screw sleeve and having a projectionthereon extending into said guide-wayand making therein a non-rotatablelongitudinally slidable connection with the standard.

7. In an extension device,a frame, an extensible member arranged in saidframe, an operating member carried in said frame in position .tothreadingly engage a portion of said extensible member, means forrotating said operating member relatively in said frame to move saidextensible'member axially therein and means having a splined connectionwith the frame and frictional engagement with the extensible member andcarried by said extensible member and coop- 8. In an extension device, aframe, a threaded extensible member arranged in said frame, an operatingmember carried in said frame in position to threadingly engage saidextensible member, means for rotating said operating member relativelyin said frame to move said extensible member, and friction meansarranged between said frame and said extensible member for preventingrelative rotation therebetween, said means comprising a member havingkeyed connection with the frame and frictional engagement with theextensible member.

9. In an extension device, a frame, an extensible member arranged insaid frame for projection and retraction with respect to the frame, anoperating member carried in said frame and having threaded engagementwith said extensible member, means for actuating said operating memberto move said extensible member axially in the frame, and friction meansarranged between said frame and said extensible member for preventingrelative rotation therebetween, said means ineluding a member keyed tothe frame and having frictional engagement with the extensible member,said frictional engagement being sufficiently great to overcome therotational urge imparted to said extensible member by the operatingmember through the threaded connection between the operating member andthe extensible member when the operating member is actuated.

10. In an extension device, a frame, an extensible member arranged insaid frame for projection and retraction with respect to the frame,anoperating member carried in said frame and having threaded engagementwith said extensible member, means for actuating said operating memberto move said extensible memberiaxially in the frame, and friction meansarranged between said frame and said extensible member for preventingrelative rotation therebetween, said means including a member havingpositive keyed connection with the frame and frictional engagement withthe extensible member, said friction member being carried at the lowerend of the extensible member.

11. In an extension device, a supporting frame, an extensible memberarranged in said frame, an operating member rotatably mounted in saidframe and having operating threaded engagement with said extensiblemember and means frictionally engaging and carried by said extensiblemember and having splined engagement with said frame to retard therelative rotation of the extensible member with respect to the frame.

12. In an extension device, a frame member, a lifting member arranged insaid frame, an operating member rotatably mounted in said frame andhaving threaded connection with said extensible member whereby theextensible member may be axially moved with said extensible member isnormally held respect to said frame upon rotation of said againstrotation.

In testimony whereof I hereto affix my sigoperating member, means forrotating said operating member, and a device extending between saidextensible and frame members, said device having frictional engagementwith one and splined engagement with the other whereby to normallyprevent relative rotation of said extensible member with respect to theframe.

13. In an automobile ask, a frame providing a standard having a verticalchannel therein, a lifting member arranged in said frame and telescopingin said channel, an operating member comprising an internally threadednut supported in the frame at the upper end of the channel, said liftingmember threading through said operating member and a second liftingmember having a load carrying head at its upper end threading into saidfirst lifting member, cooperating stops limiting the projection of thefirst member through the operating nut and the second member through thefirst mentioned member and a member carried by the first mentionedmember and having frictional engagement therewith and having a portionproviding splined connection with the frame.

1 1. An automobile jack, a frame providing a standard having a verticalchannel therein, a lifting member arranged in said frame and telescopingin said channel, an operating member comprising an internally threadednut supported in the frame at the upper end of the channel, said liftingmember threading through said operating member and a second liftingmember having a load carrying head at its upper end threading into saidfirst lifting member, cooperating stops limiting the projection of thefirst member through the operating nut and the second member through thefirst mentioned member, means for rotating said operating member and afriction device carried by the first lifting member and engaging theframe to normally prevent rotation of said extensible member withrespect to the frame but yielding to permit rotation of said extensiblemember, said frictional device having means forming a splined engagementwith the frame and frictional engagement with the lifting member.

15. In an extension device, a frame, an extensible lifting memberarranged in the frame in position to be retracted and projected axiallytherefrom, an operating member rotatably mounted in the frame and havingthreaded connection with said extensible member for imparting axialmovements thereto, said extensible member being formed to provide ashoulder adjacent its lower end, and a spring pressed clutch memberoperatively associated with said shoulder and hav ing keyed connectionwith the frame whereby nature.

